640-×=414:6 d×70=50785-1785 k-156=470×4 3200÷y=640÷160

Question

640-×=414:6
d×70=50785-1785
k-156=470×4
3200÷y=640÷160

Answer 1

1)640-х=69
х=640-69
х=571
2)d×70=49000
d=49000:70
d=700
3)k-156=1880
k=1880+156
k=2036
4)3200:y=4
y=3200:4
y=800